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BUG: unable to handle kernel paging request in prepare_error_buf

Status: upstream: reported C repro on 2024/08/17 17:42
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+99bf584fb5f18d82cba5@syzkaller.appspotmail.com
First crash: 633d, last: 3d08h
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2024/12/12 linux-6.1.y (ToT) e4d90d63d385 C [report] BUG: unable to handle kernel paging request in prepare_error_buf
2024/10/28 upstream (ToT) 819837584309 C [report] BUG: unable to handle kernel paging request in prepare_error_buf
2024/12/12 upstream (ToT) eefa7a9c0699 C Didn't crash
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 BUG: unable to handle kernel paging request in prepare_error_buf missing-backport origin:upstream 17 C error 123 50d 665d 0/3 upstream: reported C repro on 2024/07/17 12:15
▶ ▼ Fix bisection attempts (3)
Created Duration User Patch Repo Result
2025/11/09 22:37 2h24m fix candidate upstream OK (0) job log
2025/06/08 00:50 18m fix candidate upstream error job log
2025/03/19 14:05 1h19m fix candidate upstream error job log

Sample crash report:
REISERFS warning (device loop0): vs-13060 reiserfs_update_sd_size: stat data of object [2 5 0x0 SD] (nlink == 1) not found (pos 2)
REISERFS warning (device loop0): vs-13060 reiserfs_update_sd_size: stat data of object [2 7 0x0 SD] (nlink == 1) not found (pos 1)
Unable to handle kernel paging request at virtual address 00000000ffffffff
Mem abort info:
  ESR = 0x0000000096000005
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x05: level 1 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000005
  CM = 0, WnR = 0
user pgtable: 4k pages, 48-bit VAs, pgdp=000000011a28c000
[00000000ffffffff] pgd=080000011310e003, p4d=080000011310e003, pud=0000000000000000
Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4500 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : scnprintf_cpu_key fs/reiserfs/prints.c:95 [inline]
pc : prepare_error_buf+0x7cc/0x1840 fs/reiserfs/prints.c:229
lr : prepare_error_buf+0x4e4/0x1840 fs/reiserfs/prints.c:230
sp : ffff800020e672e0
x29: ffff800020e67460 x28: ffffffffffffffe2 x27: ffff80001c5b4b7e
x26: ffff7000041cce6c x25: ffff80001c5b5a7e x24: 00000000ffffffff
x23: 000000000000004b x22: ffff80001c5b5a60 x21: ffff80001c5b5a7f
x20: ffff800020e674c0 x19: dfff800000000000 x18: 0000000000000000
x17: ffff80001835b000 x16: ffff8000082eea88 x15: 0000000000000000
x14: 000000000000007a x13: 0000000000ff0100 x12: 0000000000ff0100
x11: ff00800008cbbbec x10: 0000000000000000 x9 : ffff800008cbbbec
x8 : 0000000000000000 x7 : 20726f6620686372 x6 : 7261657320666f20
x5 : ffff80001c5b4b7e x4 : ffff80001c5b5a7e x3 : ffff800011931c4c
x2 : 000000000000000f x1 : 00000000ffffffe0 x0 : 00000000ffffffff
Call trace:
 scnprintf_cpu_key fs/reiserfs/prints.c:95 [inline]
 prepare_error_buf+0x7cc/0x1840 fs/reiserfs/prints.c:229
 __reiserfs_error+0xdc/0x2a0 fs/reiserfs/prints.c:396
 reiserfs_do_truncate+0x268/0x1058 fs/reiserfs/stree.c:1930
 reiserfs_truncate_file+0x5d0/0xb00 fs/reiserfs/inode.c:2310
 reiserfs_file_release+0x734/0x8b8 fs/reiserfs/file.c:109
 __fput+0x1bc/0x7b8 fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1ec/0x278 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 do_notify_resume+0x1fa0/0x2aa4 arch/arm64/kernel/signal.c:1151
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Code: d343ff08 38f36908 35005bc8 aa1803e0 (b8404408) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	d343ff08 	lsr	x8, x24, #3
   4:	38f36908 	ldrsb	w8, [x8, x19]
   8:	35005bc8 	cbnz	w8, 0xb80
   c:	aa1803e0 	mov	x0, x24
* 10:	b8404408 	ldr	w8, [x0], #4 <-- trapping instruction

Crashes (126):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/10 06:57 linux-6.1.y 128a674368bf 29233ece .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2026/01/06 19:24 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/12/30 09:59 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/12/17 13:19 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/09/08 12:17 linux-6.1.y 28c695c365e1 d291dd2d .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/05/22 00:29 linux-6.1.y 325285d9fc86 dc5d3808 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/02/09 16:39 linux-6.1.y 0cbb5f65e52f ef44b750 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2024/10/28 13:44 linux-6.1.y 7ec6f9fa3d97 65e8686b .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2026/05/10 06:14 linux-6.1.y 128a674368bf 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2026/01/14 05:53 linux-6.1.y bec0e10ee67e d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2026/01/14 01:40 linux-6.1.y bec0e10ee67e d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2026/01/08 18:04 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2026/01/08 05:43 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2026/01/06 17:55 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2026/01/05 14:07 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2026/01/01 22:21 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/12/29 03:38 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/12/26 02:03 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/12/25 22:05 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/12/17 12:45 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/12/17 01:54 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/12/06 01:35 linux-6.1.y f6e38ae624cf d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/12/05 08:08 linux-6.1.y f6e38ae624cf d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/11/29 15:12 linux-6.1.y f6e38ae624cf d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/11/27 12:08 linux-6.1.y f6e38ae624cf d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/10/26 08:48 linux-6.1.y 8e6e2188d949 c0460fcd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/10/02 10:53 linux-6.1.y 7b34dc04e4ff 267f56c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/09/20 09:04 linux-6.1.y 363a599da6d9 67c37560 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/09/08 11:36 linux-6.1.y 28c695c365e1 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/07/15 22:27 linux-6.1.y f2198ea7eb3e 03fcfc4b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/06/09 10:01 linux-6.1.y 58485ff1a74f 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/06/02 23:27 linux-6.1.y da3c5173c55f b396b4bf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/06/02 03:55 linux-6.1.y da3c5173c55f 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/05/21 23:51 linux-6.1.y 325285d9fc86 dc5d3808 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/05/19 07:57 linux-6.1.y 325285d9fc86 f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/05/17 19:59 linux-6.1.y 02b72ccb5f9d f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/05/10 03:39 linux-6.1.y 02b72ccb5f9d 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/05/08 08:36 linux-6.1.y ac7079a42ea5 dbf35fa1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/05/04 17:12 linux-6.1.y b6736e03756f b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/05/04 10:34 linux-6.1.y b6736e03756f b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/05/03 09:07 linux-6.1.y b6736e03756f b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/05/02 03:27 linux-6.1.y 535ec20c5027 51b137cd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/04/30 17:02 linux-6.1.y 535ec20c5027 85a5a23f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/04/29 13:24 linux-6.1.y 535ec20c5027 aeb6ec69 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/04/29 11:42 linux-6.1.y 535ec20c5027 aeb6ec69 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/04/27 01:50 linux-6.1.y 535ec20c5027 c6b4fb39 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/04/26 19:13 linux-6.1.y 535ec20c5027 c6b4fb39 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/04/24 22:16 linux-6.1.y 420102835862 9882047a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/04/20 10:59 linux-6.1.y 420102835862 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/04/19 18:44 linux-6.1.y 420102835862 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/04/19 15:53 linux-6.1.y 420102835862 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/04/17 04:53 linux-6.1.y 420102835862 a95239b1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2025/04/17 00:47 linux-6.1.y 420102835862 a95239b1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2024/08/17 17:41 linux-6.1.y 117ac406ba90 dbc93b08 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_error_buf
2026/03/01 00:10 linux-6.1.y 779f9571ac3e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: user-memory-access Read in prepare_error_buf
2024/08/26 02:32 linux-6.1.y ee5e09825b81 d7d32352 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: user-memory-access Read in prepare_error_buf
* Struck through repros no longer work on HEAD.